Timeworn Br'aaxskin Treasure Maps are Grade 17, while Timeworn Loboskin Treasure Maps are grade 16. If you don't have a Miner or Botanist leveled, you can instead buy these maps from the Market Board.

A map can lead you to any of the expansion’s first five zones. As of patch 7.05, no map leads you to Living Memory, but a new 8-man map should be added in future patches with treasures hidden ...